Node script that updates the credentials file, in the case you are using the AWS SDK and AWS CLI behind AWS SSO.

setAwsCreds.js

//Using encode, parse from 'ini' lib, probably not needed *shrugs*
async function setAWSCredentials () {
    const userProfilePath = process.env[(process.platform == 'win32') ? 'USERPROFILE' : 'HOME']

    const awsCacheFile = '/.aws/cli/cache'
    const awsCredentialFile = '/.aws/credentials'

    const cachefullPath = userProfilePath + awsCacheFile
    const credsFullPath = userProfilePath + awsCredentialFile

    const fileDirectory = await fs.promises.opendir(cachefullPath)

    const filesToCompare = []
    for await (const dirFile of fileDirectory) {
        const wholeFilePath = cachefullPath + '/' + dirFile.name
        const stats = await fs.promises.stat(wholeFilePath)

        const fileObj = {
            pathToFile: wholeFilePath,
            lastModified: stats.mtime
        }
        filesToCompare.push(fileObj)
    }

    let fileToParse = filesToCompare[0].pathToFile
    if(filesToCompare.length > 0) {
        fileToParse = filesToCompare.sort((a, b) => b.lastModified - a.lastModified)[0].pathToFile
    } 

    const { Credentials: creds } =  JSON.parse(await fs.promises.readFile(fileToParse, 'utf-8'))
    const AwsConfig = {
        aws_access_key_id: creds.AccessKeyId,
        aws_secret_access_key: creds.SecretAccessKey,
        aws_session_token: creds.SessionToken,
        region: 'us-east-1'
    }

    const config = parse(await fs.promises.readFile(credsFullPath, 'utf-8'))
    config['default'] = AwsConfig

    await fs.promises.writeFile(credsFullPath, encode(config), { encoding: 'utf-8', flag: 'w' })

    AWS.config.update({
        credentials: new AWS.Credentials(AwsConfig.aws_access_key_id, AwsConfig.aws_secret_access_key, AwsConfig.aws_session_token),
        region: AwsConfig.region
    })
}

Reference to the issues this works around:

• AWS-CLI
• AWS-SDK-JS
• AWS-CLI